After [having considered] the example of the salivary-gland-cells-giant-chromosomes [in larvae of certain fruit flies], where, thanks to accidental favorable conditions, there is something morphologically histologically visible which is not in that degree visible in other cases, but nevertheless there taken to be existent too, - one today agrees to assume real structures -- which to be taken in a bondlike fashion is unavoidable -- also to be present there where they, until now, could not be made visible by any experimental means, and where the assumption of these structures means an essential simplification of the understanding.